Drying apparatus.



n' sin ,is aman g ROBERT I-I. VTSTJD,` OF GARDEN CITY, NEW YORK.

'DRYING APPARATUS.

Application filed Juli/.15, 1915. Seriallo. 39,968.

To all whom z't may concern.'

Be it known that l, ROBERT H. WYLD, a

citizen of the United States, and residing at` Garden City, Long Island, in the county of Nassau and State of New York, have invented a new and llmproved Drying Apparatus, of which the following specification is a full disclosure.

This invention deals with rotary cylindrical driers, and it proposes certain improvements enhancing the efliciency and temperature control thereof.

A primary object of this invention is by improving the construction thereof to better adapt rotary cylinder driers for transmitting heat derived from a gas or vapor in a more direct and concentrated manner to the material to be dried. For example, in the case of paper making machinery, the traveling belt of paper contacts with a portion only of the cylindrical roll, and it is, therefore, desirable that the heating eect of the steam shall be concentrated at the contacting region. This also holds true in the drying of chemicals or materials capable of adhering t0 the external periphery of the drier, and furthermore in certain instances it is desirable to'create a dierential or incremental drying effect; all of which is available by means of this invention.

llt is also within the contemplation of this invention to improve the construction whereby the heat carrying steam or other vapor will be exposed to a wiping action immediately adjacent the point of heat transmission thereby enabling the various gas particles to come into closer contact with the heat absorbing surface, thus making for a more effective heat transference.

.Another object is to `render available a construction aiordinggreater facility and adaptability in respect to the regulation of the temperatures and of the adjustment in the localization of the application or absorption of heat.

A further object is to devise a construction such that the temperature will be maintained substantially uniform from end to end in a narrow peripheral zone extending parallel with the axis of the revolving drum.

@ther objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention. j

This invention accordingly consists in the features of construction, combination of Specification of Letters Patent.

rarement nec. a, mit.

parts and in the unique relations of the members and in the relative proportioning and disposition thereof; all as more completely outlined herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the saine by the numerous modifications in structure and relation contemplated by this invention, drawings depicting a preferred form have been annexed as a part of this disclosure, and in such drawings, like characters of reference denote corresponding parts throughout all the views, of which Figure l is a front elevation partly in section showing one embodiment of this invention, and Fig. 2 isan end elevation showing further details thereof.

Continuing now by way of a more detailed description of the illustrated embodiment of this invention, A designates a shell in the nature of a cylinder having suitable ends as indicated by l provided with hubs C and having a periphery or drying surface as indicated by 2, which may, of course, conform to any desired peripheral contour. This drum will be constructed of a suitable metal and the walls will ordinarily be relatively thin following conventional practice. The drum will be mounted on suitable trunnions so that it may revolve and these trunnions can advantageously be made tubular; one of them as indicated by B being used for the admission of the steam and the other 3 affording an outlet for the spent steam. The drum may be rotated on these trunnions by any suitable means.

Located within the drum A are a number of heating elements in the nature of conduits which extend parallel with the axis and deliver the steam directly against the inner surface of that portion of the shell used for heating the material. For certain purposes these heating elements may be circumferentially equi -spaced as indi-V cated by D, D1, D2, D3, D4 and D5 therebyV giving a uniform diifusion or distribution of the heat, whereas in other instances these units may be diierentially spaced as indicated by E, F, G and H so as to yield a variable heating effect. preferably be constructed in all cases so as to produce a wiping action on the escaping vapor, as will shortly be made clear.

One of the many possible constructions for embodying this invention is shown on These "units will the drawings in which J indicates a spider steam dome@ to which steam is admitted through the bore 7 of the .trunnion B. and from this dome 6 the steam is distributed tothe various heat distributing units. The form of unit illustrated consists of a fitting 8 in the nature of an elbow which receives a pipe 9 establishing communication with the dome (i. ln case a radial adjustment is desired, the connections will be provided with one or more extensible joints, such, as for instance, the packing box 10. A distributing rpipe K is screwed into the fitting Sfat fpoint indicated by 11 so as to receive the vapor therefrom, andVv this pipeK extends. .in a direction parallel with the axis of rotation of the shell and terminates within the other endthereof in an open end indicated by 12. f An outer pipe L is screwed at 13 to the fitting 8 so as to be concentrically spaced from the vinner pipe and form a steam jacket therefor. This outer pipe L,

receives steam from the open end 12 of the inner pipe and is provided with a small opening at 14 to insure circulation. shield Ml is interposed between these pipes and the adjacent inner surface of the drum and this shield is contoured so as to form a narrow space with the drum; and a plurality of escaping vents or pipes a, b, 0, d, e, etc., enable the steam to flow from the inner ypipe K in the space intervening between theshield M and the inner periphery of 4the Adrum A. In further Aescaping the vapor must of necessity squeeze through this narrow space with a wire drawing action, thus producing a wiping effect which will cause the*variousparticles of the steam to be brought more intimately into Contact with the drum, and thereby more efliciently yield their heat to the drum.

lIn certain cases itl will be advantageous to enable this intervening spaeeto be varied in thickness, and to that end a radial ad-l justment of the parts may be provided. Thus, a mounting N connected with the fitting 8 may provide-fa shank 15 radially ad-` justable through asuitable socket in a ring 16 carriedby the spokes 5. This shank lo may yterminate in a screw threaded end which, by means of a right and left threadedA-coll'ar 17, is adjustably.` connected with the part 4. By this means the heating unit may be radially adjusted to meet any special conditions. The steam after escaping from the space intervening between the shell and shield M will be received within the general interior of the drum and will in due time escape through the bore`18 of the trunnion 3. The mounting'v of theoheating units with respect to the trunnion 3 will substantially follow the lines already indicated and, therefore, need not be further described. For certain purposes a number, or even all, of these conduits may be adj ustably mounted as indicated.

It will thus be seen that this invention is well adapted to achieve the purposes aforesaid. lt is characterized by its increased efficiency owing to the wiping action of the steam, and owing to the fact that the heating .is chiefly localized to the region where the material is treated, so that more remote portions of the drum are not needlessly maintained at the higher temperatures.

'lt will be understood that the drum will be comparatively thin and the heat interchange will, therefore, be very rapid and somewhat in the nature of an instantaneous action. Temperatures are inthis way made available which could not be attainable by means of an equally thin drum because of its incapacity for standing up under kpressures required under the old system. The heat is,

moreover, uniformly distributed in an axial direction and still may be varied so as to prevent different temperature zones in the curved direction of -the periphery of the drum.

lithout further analysis, the foregoing will so fully reveal the gist of this invention that others can by applying current knowledge readily adapt it for various applications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, I claim as new and desire to secure the following combina-tions of elements, or equivalents thereoffby Letters Patent of the United States 1. A rotary drier combining` a rotatable drinn; a stationary guard member mounted therein adjacent the inner periphery thereof to provide a thin intervening space; means for admitting heated vapor through the axis of said drum; and means for distributing said vapor through said guard into said intervening space.

'2. A rotary drier combining a rotatable drum; a conduit adjacent the inner periphery thereof extending parallel with the axis thereof; an adjustable mounting for said conduit whereby its distance from the inner periphery of said drum may be varied; and means for supplying said conduit with heated vapor through the axis of said drum.

3 A rotary drier combining a rotatable hollow drum; a plurality of conduits extending parallel with the axis of said drum'and arranged at different distances apart adjacent the inner periphery of said drum; and means for supplying said conduits with heated vapor.

4. A rotary drier combining a rotatable drum; two hollow trunnions arranged c0- axially at the opposite ends of said drum, one being adapted to admit heated Vapor and the other to discharge the spent Vapor; and a series of conduits extending parallel with the aXis of said drum connected With said first mentioned trunnion.4

5. A rotary drier combining a rotatable drum; a conduit therein extending adjacent the inner periphery of said drum; a jacket telescoping said conduit; and means for admitting heated vapor to said jacketed conduit whereby the latter may distribute said vapor to the inner periphery of said drum at a temperature substantially uniform throughout the length of said conduit.

In Witness whereof, l hereunto subscribe my name, as attested by the tWo subscribing Witnesses.

ROBERT H. WYLD. 1Witnesses:

ALBERT F. NATHAN, B. COOKE.

Gopies of this patent may be obtained for five cents each, by addressing che Commissioner of Patente, Washington, D. C. 

